SOLUTION: Please help me solve this equation:find the mean and solve an equation to find the value of x. 40,98,94,102,21,x;mean 88 thank you

Algebra ->  Expressions-with-variables -> SOLUTION: Please help me solve this equation:find the mean and solve an equation to find the value of x. 40,98,94,102,21,x;mean 88 thank you       Log On


   

Question 577088: Please help me solve this equation:find the mean and solve an equation to find the value of x. 40,98,94,102,21,x;mean 88 thank you
Answer by KMST(5328) About Me  (Show Source):
You can put this solution on YOUR website!
The mean (or average) of those six numbers is calculated by adding them, and then dividing by 6, so the definition of mean and the fact that the mean is 88 tell you that
%2840%2B98%2B94%2B102%2B21%2Bx%29%2F6=88
That first equation can be transformed, simplified, and solved:
%2840%2B98%2B94%2B102%2B21%2Bx%29%2F6=88 --> %28355%2Bx%29%2F6=88 --> %28355%2Bx%29%2A6%2F6=88%2A6 --> 355%2Bx=6%2A88 --> 355%2Bx=528 --> 355%2Bx-355=528-355 --> highlight%28x=173%29